Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of din 981 slotted round spindle lock nut for rolling bearing and spindle fixing in China. Welcome to buy bulk high quality din 981 slotted round spindle lock nut for rolling bearing and spindle fixing made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
Product Details & Standard Dimension Chart
| Thread Spec d×P | Outer Diameter dk | Nut Thickness m | Slot Width n | Slot Depth t |
| M10×1 | 22 | 8 | 4.3 | 2.6 |
| M12×1.25 | 25 | 8 | 4.3 | 2.6 |
| M14×1.5 | 28 | 8 | 5.3 | 3.1 |
| M16×1.5 | 30 | 8 | 5.3 | 3.1 |
| M18×1.5 | 32 | 8 | 5.3 | 3.1 |
| M20×1.5 | 35 | 10 | 5.3 | 3.1 |
| M22×1.5 | 38 | 10 | 5.3 | 3.1 |
| M24×1.5 | 42 | 10 | 6.3 | 3.6 |
| M25×1.5 | 42 | 10 | 6.3 | 3.6 |
| M27×1.5 | 45 | 10 | 6.3 | 3.6 |
| M30×1.5 | 48 | 10 | 6.3 | 3.6 |
| M33×1.5 | 52 | 10 | 6.3 | 3.6 |
| M35×1.5 | 52 | 10 | 6.3 | 3.6 |
| M36×1.5 | 55 | 10 | 6.3 | 3.6 |
| M39×1.5 | 58 | 10 | 6.3 | 3.6 |
| M40×1.5 | 58 | 10 | 6.3 | 3.6 |
| M42×1.5 | 62 | 12 | 8.36 | 4.25 |
| M45×1.5 | 68 | 12 | 8.36 | 4.25 |
| M48×1.5 | 72 | 12 | 8.36 | 4.25 |
| M50×1.5 | 72 | 12 | 8.36 | 4.25 |
| M52×1.5 | 78 | 12 | 8.36 | 4.25 |
| M55×2 | 78 | 12 | 8.36 | 4.25 |
| M56×2 | 85 | 12 | 8.36 | 4.25 |
| M60×2 | 90 | 12 | 8.36 | 4.25 |
| M64×2 | 95 | 12 | 8.36 | 4.25 |
| M65×2 | 95 | 12 | 8.36 | 4.25 |
| M68×2 | 100 | 15 | 10.36 | 4.75 |
| M72×2 | 105 | 15 | 10.36 | 4.75 |
| M75×2 | 105 | 15 | 10.36 | 4.75 |
| M76×2 | 110 | 15 | 10.36 | 4.75 |
| M80×2 | 115 | 18 | 12.43 | 5.75 |
| M85×2 | 120 | 18 | 12.43 | 5.75 |
| M90×2 | 125 | 18 | 12.43 | 5.75 |
| M95×2 | 130 | 18 | 12.43 | 5.75 |
| M100×2 | 135 | 18 | 12.43 | 5.75 |
| M105×2 | 140 | 18 | 12.43 | 5.75 |
| M110×2 | 150 | 22 | 14.43 | 6.75 |
| M115×2 | 155 | 22 | 14.43 | 6.75 |
| M120×2 | 160 | 22 | 14.43 | 6.75 |
| M125×2 | 165 | 22 | 14.43 | 6.75 |
| M130×2 | 170 | 22 | 14.43 | 6.75 |
| M140×2 | 180 | 26 | 16.43 | 7.9 |
| M150×2 | 200 | 26 | 16.43 | 7.9 |
| M160×3 | 210 | 30 | 16.43 | 7.9 |
| M170×3 | 220 | 30 | 16.43 | 7.9 |
| M180×3 | 230 | 30 | 16.43 | 7.9 |
| M190×3 | 240 | 30 | 16.43 | 7.9 |
| M200×3 | 250 | 30 | 16.43 | 7.9 |
Common Sourcing Pain Points of Machinery Buyers
With years of service for machinery manufacturers, hardware importers and mechanical maintenance workshops, we have summarized the most common problems encountered when purchasing spindle lock nuts:
Ordinary standard round nuts are prone to loosening after long-term high-speed operation. Loose nuts will cause bearing displacement, resulting in equipment vibration, abnormal operation and even costly mechanical failure. Many clients have to frequently shut down production lines to re-tighten loose shaft nuts, causing production delays.
One-stop Solution
A lot of generic off-spec lock nuts have inconsistent dimensions. Outer diameter, thread pitch or slot size won't match standard spindles, causing assembly delays or even damaged shafts on production lines. Engineers waste hours adjusting mismatched fasteners.
One-stop Solution
Most small suppliers only carry a couple popular sizes. Distributors need to place separate orders with multiple factories to fill their full inventory range, which pushes up logistics cost and extends lead time.
One-stop Solution
Cheap uncoated steel nuts oxidize quickly during sea shipping or warehouse storage. Rusty threads cannot lock tightly and get rejected by quality control teams upon arrival.
Product Advantages & Solutions
Every design and production detail targets the exact pain points above, no overhyped empty claims:
The four-slot clamping structure delivers stable uniform compression force around the bearing seat. Combined with matching MB lock washers, it eliminates axial movement even under constant vibration, cutting down unexpected machine downtime completely.
We strictly follow official DIN 981 dimensions for every batch. Each nut is measured for outer diameter, thickness and thread tolerance before packing, so engineers can fit them directly on standard spindles without any modification.
Our warehouse keeps full stock from M10 up to M200 standard sizes at all times. Hardware dealers can source all required spindle retaining nuts from one single supplier to cut extra shipping fees and simplify order management.
Mass stock storage allows us to ship orders within short lead times, even for large bulk purchases. Clients facing rush maintenance or production demands won't get stuck waiting for production cycles.
Application Scenarios
This DIN 981 slotted lock nut acts as a critical spare fastener across nearly all rotating mechanical equipment, our regular buyers mainly apply it in these fields:
Motor and gearbox manufacturing is our biggest demand sector. Factories use these retaining nuts to fix rolling bearings on drive spindles for industrial motors, reduction gearboxes and transmission assemblies.
01
Lathes, CNC machines and automated production lines also rely on this standard spindle nut. Precision equipment needs consistent locking force to keep machining accuracy during continuous operation.
02
Agricultural and construction machinery takes a large share of bulk orders too. Farm tractor drive shafts, excavator rotating joints all need vibration-resistant lock nuts to stand harsh working conditions.
03
Water pumps, hydraulic valves and fluid processing equipment use our DIN 981 nuts to lock pump spindles, where steady sealing and positioning are required to prevent liquid leakage.
04
Hardware wholesalers and machinery repair shops stock all sizes as replacement spare parts, offering quick component changes for local factory maintenance service requests.
05
Tired of Troubles on Bolt Purchasing? We've Got All Fixes Ready!
Real troubles from 4 types of end buyers, with targeted answers
Construction & New Energy (Civil Construction, PV Power Station, Coastal Outdoor Projects)
Q: How to stop bolt rust and avoid costly rework losses for seaside outdoor construction?
Pain: Many buyers suffered heavy losses before. Improper coating leads to severe rust soon after installation. Removing and reinstalling costs extra labor and material fees, delays the whole project, and even causes fines from clients, making the project end up losing money.
Answer: We fully understand your loss risks on projects. We select proper finishes like zinc plating or Dacromet based on local humidity and coastal environment. Full test certificates come with each batch. We arrange priority urgent delivery for sudden onsite demands to effectively cut your rework risks.
Equipment Manufacturing (Auto Parts, General Machinery, Precision Instruments, Wind Power & Petrochemical Heavy Industry)
Q: Can you customize tiny precision screws and high-temperature high-strength bolts for new product sampling & small trial orders?
Pain: Most large manufacturers refuse small trial orders, while small workshops fail to control hardness and dimensional tolerance. Defective fasteners get stuck or crack during assembly, pause equipment debugging and delay your new product launch schedule.
Answer: We know how tough R&D and trial production can be. We value every sample order no matter the quantity. With our in-house heat treatment workshop, we strictly control tolerance for precision parts and mechanical performance for high-strength bolts, never cut corners to avoid your production suspension caused by poor fastener quality.
Hardware Trade & Processing (Hardware Wholesalers, Electrical & Sheet Metal Factories, Import Distributors)
Q: Is mixed-container loading available for mixed items? Can customized logo and private packaging be arranged for small orders?
Pain: Purchasing full containers of single item locks up massive capital and brings high overstock risks. Most big factories reject mixed small orders and refuse OEM marking, restricting your brand building and product diversification.
Answer: We totally get your capital pressure for stocking goods. We support flexible mixed container loading. Custom laser marking and private packing are available even for small orders. One-stop sourcing saves your stocking cost and helps you expand customers easily with rich product ranges.
Standard Compliance, QC & After-sales (Global Importers from Europe, America, Africa)
Q: Can you provide official certificates, third-party inspection and reliable after-sales support?
Pain: Many suppliers provide fake or incomplete documents. Non-compliant goods get detained at customs with expensive detention charges. Suppliers often shirk responsibilities once quality defects appear, leaving you losing both goods money and shipping cost.
Answer: Honesty is our core business principle. All goods are produced per DIN/ISO/ANSI standards. We supply factory test reports and third-party inspection documents as required. If defects result from our production, we never avoid obligation and negotiate proper after-sales solutions actively for you.
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